Table 2

 Prevalence and odds ratios of cerebral palsy in RGSC groups (singleton births)

% of total singleton birthsChildren with CPTotal childrenPrevalence/1000OR (95% CI) (RGSC 1 as reference)OR adjusted for BW and gestation (95% CI)
RGSC 114.616150181.11.001.00
RGSC 220.448209742.32.15 (1.22 to 3.78)2.09 (1.19 to 3.69)
RGSC 3NM13.635139152.52.36 (1.31 to 4.26)2.25 (1.24 to 4.06)
RGSC 3M29.968306492.22.08 (1.21 to 3.59)1.89 (1.09 to 3.26)
RGSC 46.21363822.01.91 (0.92 to 3.98)1.71 (0.82 to 3.56)
RGSC 55.31554782.72.57 (1.27 to 5.21)2.11 (1.04 to 4.30)
Unclassified6.01861122.92.77 (1.41 to 5.44)2.15 (1.08 to 4.27)
RGSC missing4.0424081
χ2 for linear trend5.9 (p = 0.02)
4.2 (p = 0.04) if unclassified group excluded